I don't see your point. If consoles focus on 4k, PC will have it easier on v-ram in comparison towards last generation. If you story about SSD's would work then even 16gb of v-ram would be useless anyway which isn't helping as argument against what i said.
I make all the sense, because higher resolutions consumes more v-ram. AC odyssey consumes 4,6gb of v-ram on my 1080ti at 1080p and 6,5gb on 4k.
This sounds more like what carmack did back in the day, where they started to adress harddrives for mega textures. However all of those examples is a fixed camera view that barely moves. what if they jank the camera to the other side of the room, u probably get the same issue that nothing gets loaded. While SSD idea is great, i don't see it work or being practical in any game scenario other then fixed area's. I could be wrong here. But i can't see SSD's replace Ram even remotely. For loading in 8k textures and bigger files faster same way traditional harddrives are used sure. but again PC will barely sit at 4k or even 8k so its not really going to matter anyway.